If the number of cars in city X this year is 520,800 which is 24% more

Question

If the number of cars in city X this year is 520,800 which is 24% more than there were in city X last year, how many cars were there in city X last year?

A. 395,808
B. 420,000
C. 447,888
D. 496,800
E. 645,795

0akshay0 · Answer

lets X = original number of cars
24% more than X can be written as
1.24*X = 520800
 X = 420000

Hence option B is correct

JeffTargetTestPrep · Answer

We are given that the number of cars in city X this year is 520,800, which is 24% more than there were in city X last year. If we let the number of cars in city X last year = c, we can create the following equation:

520,800 = 1.24c

c = 420,000

Answer: B

SeregaP · Answer

520 800=1,24*last year
last year is 520800/1,24=420000

Abhishek009 · Answer

\frac{520800}{124}*100

= 420,000

Thus, answer must be ( B ) 420,000

EMPOWERgmatRichC · Answer

Hi All,

We're told that the number of cars in city X this year is 520,800 and that total is 24% more than there were in city X last year. We're asked for the number of cars that were there in city X last year. While the numbers in this prompt are not 'pretty', the answer choices are 'spaced out' enough that we can do a bit of estimation and some 'brute force' math to get to the answer.

To start, 24% of 100,000 = 24,000 (so a 24% increase would be 124,000 total cars). Thus, we can quickly map out increases of 100,000 cars... 
200,000 + 48,000 = 248,000 
300,000 + 72,000 = 372, 000 
400,000 + 96,000 = 496,000 
500,000 + 120,000 = 620,000

Since 520,800 is far closer to 496,000 than it is to 620,000, the total number of cars last year would be a bit more than 400,000. There's only one answer that matches...

Final Answer:  B

GMAT assassins aren't born, they're made, 
Rich

shashankism · Answer

Number of cars in City X this year = 520,800
It is 24% more than there were in City X last year.
So 520800 = 1.24 * cars last year 
Cars last year = 520,800/ 1.24 = 420,000

Answer B

If the number of cars in city X this year is 520,800 which is 24% more

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If the number of cars in city X this year is 520,800 which is 24% more

Prep Toolkit

615 to 715 in 15 Days (Ria's Strategies)

More than Quant/Verbal Abilities: Speed vs. Accuracy

745 with Only Self-Prep and GMAT Club

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Perfect 805 Score Debrief by Julia

My Rewards